How the data is broken out is really subjective, and I've also seen the all-cause mentioned as the leading cause of death.
The data I found simply referred to "Gun related injury" as the cause of death. (Changed my response to reflect that.) But my response was simply to clarify the answers presented in the original post, where there's not enough data to make anything more than broad assumptions about what was being discussed. Some sources seem to include gun deaths in all-cause accidents.
The one data point that is factual, abortions kill more children than pretty much every other cause listed, en toto.
Data that I used for gun vs motor deaths. (nejm.org)
This one only calls 1-17yo children, and motor vehicles become the top cause. (congress.gov)
Yeah I get you. I bristle with annoyance anytime the media or someone on twitter points out statistics because I know it probably subjective nonsense for their narrative.
It always is. There are two sides to the story, all of those sides have two more ad infinitum.
It's really worthless to try and pin something like this down except for that one data point that lays so far out of bounds that you go "Yeah, that's it."